STIGQter: STIG Summary: Cisco NX-OS Switch RTR Security Technical Implementation Guide Version: 2 Release: 1 Benchmark Date: 23 Apr 2021:

The Cisco switch must be configured to use encryption for routing protocol authentication.

DISA Rule

SV-221074r622190_rule

Vulnerability Number

V-221074

Group Title

SRG-NET-000168-RTR-000077

Rule Version

CISC-RT-000040

Severity

CAT II

CCI(s)

• CCI-000803 - The information system implements mechanisms for authentication to a cryptographic module that meet the requirements of applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance for such authentication.

Weight

10

Fix Recommendation

Configure all routing protocol authentications to encrypt the authentication key.

BGP Example

SW1(config)#switch bgp nn
SW1(config-switch)#neighbor x.x.x.x password xxxxxx

EIGRP Example

SW1(config)# router eigrp 1
SW1(config-router)# authentication mode md5
SW1(config-router)# end

or

Authentication for the EIGRP neighbor

SW1(config)# int e2/21
SW1(config-if)# ip authentication mode eigrp 1 md5
SW1(config-if)# end

Note: Interface authentication overrides process authentication.

IS-IS Example

SW1(config)# int e2/20
SW1(config-if)# isis authentication-type md5 level-1

OSPF Example

SW1(config)# int e2/2
SW1(config-if)# ip ospf authentication message-digest
SW1(config-if)# ip ospf message-digest-key 1 md5 xxxxxxxxxxx

RIP Example

SW1(config)# int e2/8
SW1(config-if)# ip rip authentication mode md5

Check Contents

Review the switch configuration. For every routing protocol that affects the routing or forwarding tables, verify that neighbor switch authentication is encrypting the authentication key as shown in the examples below:

BGP Example

router bgp 1
router-id 1.1.1.1
address-family ipv4 unicast
neighbor 10.1.12.2 remote-as 2
password 3 3ec66c90c104ad13

Note: BGP authentication uses MD5.

EIGRP Example

interface Ethernet2/21
no switchport
ip router eigrp 1
ip authentication mode eigrp 1 md5

or

router eigrp 1
authentication mode md5

Note: Interface authentication overrides process authentication.

IS-IS Example

interface Ethernet2/20
no switchport
isis authentication-type md5 level-1

OSPF Example

interface Ethernet2/2
no switchport
mac-address 0000.0000.002f
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 3 3ec66c90c104ad13

RIP Example

interface Ethernet2/8
no switchport
ip rip authentication mode md5

If the routing protocol is not encrypting the authentication key, this is a finding.

Vulnerability Number

V-221074

Documentable

False

Rule Version

CISC-RT-000040

Severity Override Guidance

Review the switch configuration. For every routing protocol that affects the routing or forwarding tables, verify that neighbor switch authentication is encrypting the authentication key as shown in the examples below:

BGP Example

router bgp 1
router-id 1.1.1.1
address-family ipv4 unicast
neighbor 10.1.12.2 remote-as 2
password 3 3ec66c90c104ad13

Note: BGP authentication uses MD5.

EIGRP Example

interface Ethernet2/21
no switchport
ip router eigrp 1
ip authentication mode eigrp 1 md5

or

router eigrp 1
authentication mode md5

Note: Interface authentication overrides process authentication.

IS-IS Example

interface Ethernet2/20
no switchport
isis authentication-type md5 level-1

OSPF Example

interface Ethernet2/2
no switchport
mac-address 0000.0000.002f
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 3 3ec66c90c104ad13

RIP Example

interface Ethernet2/8
no switchport
ip rip authentication mode md5

If the routing protocol is not encrypting the authentication key, this is a finding.

Check Content Reference

M

Target Key

4075

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